Cultivator-tooth



(No Model.)

J. C. BIRD.

GULTIVATQR TOOTH.

No. 397,962'. Patented Feb. '19. 1889.

IN-VENTOR ttorney,

.55.255? eef l N. IKMN WITJVESSES lzwzl.%weza UNITED STATES PATENT EETCE.

JOSEPH C. BIRD, OF RISING SUN, MARYLAND.

CU LTlVATOR-TOOTH.

SPECIFICATION forming part of Letters Patent No. 397,962, dated February 19, 1889.

Application tiled October 13, 1888. Serial No. 288,050. (No model.)

To all whom t may concern:

Be it known that I, JOSEPH C. BIRD, a citizen of the United States, residing at Rising Sun, in the county of Cecil and State of Maryland, have invented certain new and useful Improvements in Cultivator-Teeth; and I do declare the following to be a full, clear, and exact description otl the invention, such as will enable others skilled in the art to which 1t appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and iigures of reference marked thereon, which form a part of this specification.

This invention relates to cultivator-teeth which are mounted elastically and are capable ot' yielding when a rigid obstrnctionis met.

The invention embodies certain structural features, which will hereinafter be fully described in the accompanying specification, and definitely indicated in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a eultivator-tooth embodyingI my invention. Fig. i is a rear elevation of the same. Fig. is a detached view of one of the connecting-arms. Fig. ci shows a joint of the plow-supports.

At 1 is represented the drag-bar to which the tooth is attached, said bar being attached to the beam of the cultivator in any suitable manner. The bar is bent downwardly, as shown. On a bolt passing through the lower end, and on opposite sides of the bar, are pivotally hung two elbow-levers, in 2', bent at their lower ends so as to meet when drawn together, as shown in Fig.` 2, the meeting faces locking together, one being grooved to receive a tongue on the other. (See Fig. 4,) On a bolt passingl through one of the arms of each lever are pivoted bars o', which are provided with arms 7 7 at their upper ends, the arms being at an angle to the main portion or stem. Between the arms is pivotally supported a wheel or roller, 8, bearing on a guide-bar, 9,' secured to the drag-bar, as shown. The guide-bar is provided with a curved recess, 10, in which the roller normally rests. The lower wall of the recess extends around the roller to a point beyond a vertical line passing through its center, so as to form a safe stop. The upper wallv of the recess terminates on the inside of a vertical line passing through the center of the roller. The extremities of the limbs 7 are bent, as shown at 1.0, Fig. 3, so that they will meet over the guide-bar and prevent the roller be ing thrown off the guide-bar when the tooth receives a sudden shock. At a point intermediate between the roller and the lower ends of the bars 6 G is pivotally hung a rod, 11, provided with a screw-threaded stem near the pivot, on which is a tension-nut, 12, co-operating with a coil-sprin g, 123, said spring being seated at its opposite end against a washer on the rod 11. The outer end of the guide-bar 9 is bent downwardly and provided with a slot, 14, through which the rod may pass, the walls of the slot preventing the washer passing through. rlhe side walls of the slot are each provided with an arc-shaped protuberance or lug, 20, (indicated in dotted lines, Fig. 1,) against which the washer is pressed by the spring. vThese lugs have an important function in permitting the end of the spring to be squarely seated against the washer irrespectvely of the angular deflection of the rod, as the washer can rock on the apexv of the lug when the pivotal point 15 is shifted under strain. If the washer were seated firmly, the spring would bear on the washer only at a point when the pivot 15 was shifted, and its resiliency would cause it to bulge at the middle, crowding it hard against the bar 11, thus introducing so strong a resistance to action that the whole device lwould be rendered inefficient. By the provision described, however, the rod can always play up and down in the spring without friction, the resiliency of the spring being the only thing to be overcome to allow the plow to yield.

It will be evident that by adjusting the nul 12 the tension of the spring 13 may be varied within wide limits. The plow or tooth is shovel-shaped, as shown in Iiigs. 1. and 2, and may be reversed. Said plow is provided with a central pin, which e xtends between the arms 2 2 and through a clamp, 1G, the latter having side wings which embrace the arms 2 2 and lock them together and to the plow when the nut 17 is tightened. The wings of the clamp prevent any lateral displacement, while IOO lli

the tongue-.find-groove joint :ihove ieferred lo and clearly shown in Fig. prevents Athe .firms slipping over one another.

The operation willV now lio nn `lerstood- \\'hen the plow strik'ee n rigid olifstruei ion, the roller is forced to ride over the ridge 17 and along the guido-hm.' until the obstruction :is cleared. The dotteil linee in Fig. l illustrate the relzllive position of the paris during,` thi@l movement. The rod ll is foreedthrough slot ll against the tension o|1` spring;- 'li, whioh reflets und forees the plow lmet' lo itw` normal position :is soon :is lhe ohm ruel ion is puesed. li. will Vhe noted. that the Shovel-plow has n lirm sent against the two arms oli' ilsI support 2 2.', and emi lio adjusted to various positions on the .Same Irv Simply loosening ille nut i7 21nd Ieliding the pin lo thedesired point. The plow can thus he adj usi ed to work nt dii'lerent depths in the Soil. ly nothing the parte' Vin duplicate, :is deseribed, n` great economyY in nmnufoeiure and nmier'ial is olli'eeted.

In machines where plow-supporte oli' the loop character shown nre need they nre enst inV ono piece. Sudden shoelcs are liable lo brezil( Them. AWhen made :1S shown, they ('nn he Stzlimlgied out .'rom niulleitlile mel'nl h vzi die in duplicate or (nu lie enst with less diliieuli;Y und afterward rendered innllenlile Irv :in v .Quilahle t renti nen l..

llo-ving thuev defuflfilnul in v in veniion, what l elaim as new, and deeire lo .Geeure hv Leiterl Patent, is-

l. ln t cultivalor-moth, the eomhiimtion ol' n pivoted plow-luipporl', n. lmrpivotallv oonneotied to said support, n guide-roller S :ured to the hair, :t fixed guide eoo1ierating with the roller, an obstruction on the guide ovorwhieh I the roller must ride when the plow yields, mld a Spring;` engaging the hor and holding?,` the roller and plow in their normal positions.

2. The combination ol' the dragdmr l, zmgle-lever pivotefl thereto, hor G, roller S, guide 9,'relftini11g-hook on bar 7 to prevent dislodge ment of the roller, and a. Spring' eo-operatng with bnr (3 for inaintaining the parts in their normal positions.

3. ln ay eultivatontooth, the combination of drug-har l, plow'support pivoted thereto, a Gunih-arm on said support, bar 6, pivoted tl'iereto, Said bar being provided with a relliii'linig'diook cooperating,r with L guide, 9, a roller (":trried by the arm en gagingthe guide, rod ll, adopted to pass tlnfough a. Slotin guide fl, and springr lil, ('o-operating with said rod.

l-. 'lhe Combination of :t pivoted plow, pivoled 'har (fo-(niiemting therewith, roller S, `guide (l I'or said roller, :t springto hold'the roller ond plow in their nornml positiollS, and n recess in the guide in whichv the roller normolly rests.

o. The oonflhinzttion ol` the elhowflever 9, at plow earried by one nr'm, hors G U, pivotztlly secured to the other arm, `guide 9, arms 'Tj 7', lient to meet over the guide, roller S, pivoted between the b21-re, and n, springl 'For holding the roller against the guide.

f. 'lhe eonihinntion oli' :l Slotted gnidedmr, 9, rod lil, having' one end mounted on L movnhle pivot, l5, the other end enteringl the Slot ol the guide-har, spring lil, washer 2.1, against which the sjiin'ing is sented, and lugs 20, on which the washer heure, ne and Vfor the pur pose set forth.

In testimony whereof l n-i'fix my si g'nzttu re in presence of two witnessee.

JOSEPH C. l-lRD.

li'itneeses:

J. F15-:AMC Foe'rinc, WILMER l. BIRD. 

